Luffing crane



March 5, 1929. R. WILTS 1,704,643

LUFFING CRANE Filed June 20, 1927 um/n10;

712010" If Mus (Tubman Patented Mar. 5, i929.

RUDOLF WILTS, or BREMEN, GERMANY.

1 meters Fries.

LU FING CRANE.

Application filed June 20, 1927, Serial No. 200,219, and in Germany May'7, 1926. V

Lufling-cranes with inclined oscillating axle for the jib are known. Inluffing-cranes of this type the jib-head oscillates on an elliptic guidebar the fulcrum pointof which is the inclined axle. The charge is notswung in a plane from forward to the rear but it describes an ellipticcourse which is more or less strongly set off in accordance withtheangle of inclination of the axle. Cranes of this type cannot work onone holst opening ashas to be done according to the invention.

The invention has for its object to make two cranes work on one shipshatch to ac celerate the loading and discharging ofthe ships. 7 7

According to the invention the jib executes, with regard to thehorizontal pivot axis, such a a movement that the charge swingslaterally parallel along the crane frame.

I It has been proposed to construct cranes as slewing cranes. I Incombination with a lb having a later ally projecting or set off jib headthe applica 7 tion of the, oscillability presents the advantage that,when the ships hatches are not situated accurately on the plane ofoscillation of the jib head the charge may be swung along the portalfrom forward to the rear at an angle to the portal. 7 Anothercharacteristic feature of the invention is that. a luffing crane of theimproved construction is constructed as a slewing crane. An embodimentof the invention is illustrated, by way of example, in" theaccompanyingdrawing in which I Fig. 1 shows the improved crane in front elevation. IV 1 Fig. 2- shows the crane in. side elevation in the position prior tothe lifting of the load.

The hitting-crane has an oscillatable arm or jib b pivotable around ahorizontal axle 6. This jib projects laterally-at an angle to thevertical plane of its base or supporting frame d and its extremity or bis offset a frame mounted set laterally with relation to at an'angle tothe arm in the same direction so that, when the jib is oscillatingaround hatch-crown the merely by luffing the jib. On the portal althesupporting vframe z' for the crane beam is mounted on a base plate 9pivotable around a vertical axle g After the load 1 The,lifting-lufiing-and slewing-gear, and I the drivers stand are locatedin the cabin d. The jib has, as usual, a counter weight 7.

The jibmaybe operated, in any suitable manner, by direct tooth geardrive or by hauling in by means of ropes.

The advantages consist specially in that. the load to be lifted ischarged and dis charged: merely by lifting out rotation of the crane.

I claim: l

1. A crane comprising 'a supporting base,

on said base to rotate on a vertical axls, and a cranearm mounted on andluffing withthe framebetween the vertical center and,

one side of the frame to swing on a hori= zontal transverse axis, theportion "of the crane arm above the said horizontal trans- I tip-at .anoutward and upwardlateral angleto-f- Of the opposite side of the frameand base', where verse axis being inclined toward its ward and beyondthevertical plane by in shifting a load'supported from the arni tip byrotation of the arm on the horizontal transverse axis'the load will bemovedifrom' front to rear 01, vice'versa close to and par 'allel withthe latter-named side of the frame andbase. v

2. A lufling-crane as specified in claim 1 in which the free end of thecrane arm is 0H- the offset arm and in the same direction.

In testimony whereof I affix my signature RUDOLF WILTS

